/*
 Copyright  2002-2007 MySQL AB, 2008 Sun Microsystems
 All rights reserved. Use is subject to license terms.

  The MySQL Connector/J is licensed under the terms of the GPL,
  like most MySQL Connectors. There are special exceptions to the
  terms and conditions of the GPL as it is applied to this software,
  see the FLOSS License Exception available on mysql.com.

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; version 2 of the
  License.

  This program is distributed in the hope that it will be useful,  
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  02110-1301 USA



 */
package com.mysql.jdbc.jdbc2.optional;

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.Name;
import javax.naming.RefAddr;
import javax.naming.Reference;
import javax.naming.spi.ObjectFactory;

import com.mysql.jdbc.NonRegisteringDriver;

/**
 * Factory class for MysqlDataSource objects
 * 
 * @author Mark Matthews
 */
public class MysqlDataSourceFactory implements ObjectFactory {
	/**
	 * The class name for a standard MySQL DataSource.
	 */
	protected final static String DATA_SOURCE_CLASS_NAME = "com.mysql.jdbc.jdbc2.optional.MysqlDataSource";

	/**
	 * The class name for a poolable MySQL DataSource.
	 */
	protected final static String POOL_DATA_SOURCE_CLASS_NAME = "com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource";

	/**
	 * The class name for a MysqlXADataSource
	 */
	 
	protected final static String XA_DATA_SOURCE_CLASS_NAME = "com.mysql.jdbc.jdbc2.optional.MysqlXADataSource";
	
	/**
	 * DOCUMENT ME!
	 * 
	 * @param refObj
	 *            DOCUMENT ME!
	 * @param nm
	 *            DOCUMENT ME!
	 * @param ctx
	 *            DOCUMENT ME!
	 * @param env
	 *            DOCUMENT ME!
	 * @return DOCUMENT ME!
	 * @throws Exception
	 *             DOCUMENT ME!
	 */
	public Object getObjectInstance(Object refObj, Name nm, Context ctx,
			Hashtable env) throws Exception {
		Reference ref = (Reference) refObj;
		String className = ref.getClassName();

		if ((className != null)
				&& (className.equals(DATA_SOURCE_CLASS_NAME) || className
						.equals(POOL_DATA_SOURCE_CLASS_NAME) ||
						className.equals(XA_DATA_SOURCE_CLASS_NAME))) {
			MysqlDataSource dataSource = null;

			try {
				dataSource = (MysqlDataSource) Class.forName(className)
						.newInstance();
			} catch (Exception ex) {
				throw new RuntimeException("Unable to create DataSource of "
						+ "class '" + className + "', reason: " + ex.toString());
			}

			int portNumber = 3306;

			String portNumberAsString = nullSafeRefAddrStringGet("port", ref);
			
			if (portNumberAsString != null) {
				portNumber = Integer.parseInt(portNumberAsString);
			}

			dataSource.setPort(portNumber);
			
			String user = nullSafeRefAddrStringGet(NonRegisteringDriver.USER_PROPERTY_KEY, ref);

			if (user != null) {
				dataSource.setUser(user);
			}

			String password = nullSafeRefAddrStringGet(NonRegisteringDriver.PASSWORD_PROPERTY_KEY, ref);

			if (password != null) {
				dataSource.setPassword(password);
			}

			String serverName = nullSafeRefAddrStringGet("serverName", ref);

			if (serverName != null) {
				dataSource.setServerName(serverName);
			}

			String databaseName = nullSafeRefAddrStringGet("databaseName", ref);

			if (databaseName != null) {
				dataSource.setDatabaseName(databaseName);
			}

			String explicitUrlAsString = nullSafeRefAddrStringGet("explicitUrl", ref);

			if (explicitUrlAsString != null) {
				if (Boolean.valueOf(explicitUrlAsString).booleanValue()) {
					dataSource.setUrl(nullSafeRefAddrStringGet("url", ref));
				}
			}

			dataSource.setPropertiesViaRef(ref);

			return dataSource;
		}

		// We can't create an instance of the reference
		return null;
	}
	
	private String nullSafeRefAddrStringGet(String referenceName, Reference ref) {
		RefAddr refAddr = ref.get(referenceName);
		
		String asString = refAddr != null ? (String)refAddr.getContent() : null;
		
		return asString;
	}
}